JP2010261645A - Replacement ventilation system and replacement ventilation method - Google Patents

Abstract

To improve heating efficiency in a replacement ventilation system.
A replacement ventilation system (1) that ventilates an air-conditioned space by supplying air into the air-conditioned space (10) and exhausting the air-conditioned space (10). The exhaust ports 21 and 22 are provided at the upper and lower portions of the air-conditioned space 10, and the exhaust ports 21 provided at the upper portion of the air-conditioned space 10 are made higher than the upper end of the air supply port 17, The exhaust port 22 provided at the top of the air supply port 17 has a height that does not exceed the upper end of the air supply port 17. During cooling operation, low-temperature air is blown from the air supply port 17 and exhausted from the exhaust port 21 provided at the upper part of the air-conditioned space 10. During the heating operation, high-temperature air is blown out from the air supply port 17 and exhausted from the exhaust port 22 provided in the lower portion of the air-conditioned space 10.
[Selection] Figure 2

Description

  The present invention relates to a replacement ventilation system and a replacement ventilation method.

For example, in a high-ceiling air-conditioned space such as a factory or warehouse, a replacement ventilation system (Displacement)
Ventilation System) is known (see, for example, Patent Documents 1 to 3). When cooling with this replacement ventilation system, air at a slightly lower temperature than room temperature is supplied to the work area formed in the lower part of the air-conditioned space at a slow air supply speed (generally 0.2 m / s or less). However, contaminants such as dust and gas generated in the air-conditioned space are conveyed upward in the air-conditioned space by the upward flow generated when the air is heated by a heating element or the like existing in the air-conditioned space. Then, the air-conditioning space is ventilated by exhausting the pollutant together with the heated air from an exhaust port provided on the ceiling or the like.

  In such a replacement ventilation system, a region having a high pollutant concentration at a high temperature is formed in the upper part of the air-conditioned space. Since air with high pollutant concentration is exhausted without being stirred, the work area is maintained in a clean environment, and the temperature of the work area can be maintained within a comfortable range without lowering the supply air temperature. is there. Thus, the replacement ventilation system is expected as an air conditioning system capable of energy saving and high ventilation efficiency operation.

JP 2007-292365 A JP 2008-267702 A Japanese Patent No. 2862149

  By the way, when warm air is supplied to the lower part in the air-conditioned space in order to perform heating by this replacement ventilation system, the warm air rises by buoyancy and flows upward without spreading in the work area. For this reason, there exists a difficulty that the heating efficiency with respect to a working area is not high. On the other hand, if the warm air supply speed is increased in order to spread the warm air to the work area, there is a possibility that the person in the work area may feel uncomfortable due to the wind speed.

  An object of the present invention is to improve the heating efficiency in a replacement ventilation system.

  In order to achieve this object, according to the present invention, there is provided a replacement ventilation system that ventilates an air-conditioned space by supplying air into the air-conditioned space and exhausting the air-conditioned space. An air supply port is provided in the lower part, an exhaust port is provided in the upper part and the lower part of the air conditioned space, and an exhaust port provided in the upper part of the air conditioned space is made higher than the upper end of the air supply port, The exhaust port provided in the lower part is set to a height that does not exceed the upper end of the air supply port. During cooling operation, low-temperature air is blown from the air supply port and exhausted from the exhaust port provided in the upper part of the air-conditioned space. In the heating operation, a replacement ventilation system is provided that blows out high-temperature air from the air supply port and exhausts air from an exhaust port provided in a lower portion of the air-conditioned space.

  During the cooling operation of the replacement ventilation system, low-temperature air is blown into the air-conditioned space from the air supply port provided at the lower part of the air-conditioned space. Thus, the low-temperature air supplied to the work area formed in the lower part of the air-conditioned space is heated by a heating element or the like existing in the work area, and eventually becomes an upward flow. Due to the upward flow generated in this way, contaminants such as dust and gas generated in the air-conditioned space are conveyed upward in the air-conditioned space. Then, the pollutant is exhausted together with the heated air from the exhaust port provided in the upper part of the air-conditioned space, and the air-conditioned space is ventilated.

  On the other hand, during the heating operation of the replacement ventilation system, high-temperature air is blown into the air-conditioned space from the air supply port provided in the lower part of the air-conditioned space. Thus, the high-temperature air supplied to the work area formed in the lower part of the air-conditioned space rises by buoyancy and flows upward without spreading into the work area. However, in this replacement ventilation system, exhaust is performed from an exhaust port provided in the lower part of the air-conditioned space during heating operation. As a result, the high-temperature air once rising to the upper part in the air-conditioned space is returned again to the work area formed in the lower part in the air-conditioned space, and the heating efficiency for the work area is improved.

  In this replacement ventilation system, a heating element may exist in the lower part of the air-conditioned space, and an exhaust port provided in the upper part of the air-conditioned space may be provided at a position higher than the upper end of the heating element. Thus, by making the exhaust port provided in the upper part of the air-conditioned space higher than the upper end of the heating element, a temperature gradient in which the temperature gradually decreases from the upper end of the heating element to the exhaust port is formed inside the air-conditioned space. The In this case, it is desirable that the position of the exhaust port provided in the upper part of the air-conditioned space be as high as possible. For example, the position of the exhaust port provided in the upper part of the air-conditioned space is higher than the middle height between the upper end of the heating element and the ceiling of the air-conditioned space. Set the position higher. By making the position of the exhaust port provided in the upper part of the air-conditioned space as high as possible, the gradient of the temperature gradient formed inside the air-conditioned space from the upper end of the heating element to the exhaust port can be reduced, and the vertical temperature in the air-conditioned space can be reduced. Change can be reduced. In addition, by setting the position of the exhaust port provided in the upper part of the air-conditioned space as high as possible, it is possible to avoid that hot air existing near the ceiling of the air-conditioned space falls to the work area.

  Further, a plurality of air supply chambers provided with the air supply ports may be provided, and the number of the air supply chambers may be variable. For example, if the amount of air supplied into the air-conditioned space is constant, the air supply speed into the air-conditioned space can be changed by changing the number of air supply chambers. That is, by reducing the number of air supply chambers blown out, the supply speed of air blown from the air supply port into the air-conditioned space can be increased, and thereby air conditioning induced by the air blown into the air-conditioned space. The amount of air attracted in the space will increase. Conversely, by increasing the number of air supply chambers blown out, the supply speed of air blown from the air supply port into the air-conditioned space can be slowed down, and this is attracted by the air blown into the air-conditioned space. The amount of air attracted in the air-conditioned space will be reduced. In this way, by changing the number of air supply chambers, the amount of air that is attracted by the air that is blown into the air-conditioned space can be increased or decreased.

  According to the present invention, there is also provided a replacement ventilation method for ventilating an air-conditioned space by supplying air into the air-conditioned space and exhausting the air-conditioned space, wherein an air supply port is provided at a lower portion of the air-conditioned space. An exhaust port is provided in the upper and lower portions of the air-conditioned space, and an exhaust port provided in the upper portion of the air-conditioned space is higher than an upper end of the air supply port, and is provided in a lower portion of the air-conditioned space. The height of the exhaust port does not exceed the upper end of the air supply port. During cooling operation, low-temperature air is blown out from the air supply port and exhausted from the exhaust port provided in the upper part of the air-conditioned space to perform heating operation. Sometimes, a replacement ventilation method is provided in which high-temperature air is blown from the air supply port and exhausted from an exhaust port provided in a lower portion of the air-conditioned space. According to this replacement ventilation method, during cooling operation, contaminants such as dust and gas generated in the air-conditioned space are exhausted together with the heated air from the exhaust port provided in the upper part of the air-conditioned space. Ventilation is performed. Moreover, at the time of heating operation, the high-temperature air once raised to the upper part in the air-conditioned space is returned to the work area formed in the lower part in the air-conditioned space, thereby improving the heating efficiency for the work area.

  In this replacement ventilation system, a heating element may exist in the lower part of the air-conditioned space, and an exhaust port provided in the upper part of the air-conditioned space may be provided at a position higher than the upper end of the heating element. Thus, by making the exhaust port provided in the upper part of the air-conditioned space higher than the upper end of the heating element, a temperature gradient in which the temperature gradually decreases from the upper end of the heating element to the exhaust port is formed inside the air-conditioned space. The

  Further, a plurality of air supply chambers provided with the air supply ports may be provided, and the air may be blown out from a smaller number of air supply chambers during the heating operation than during the cooling operation. Then, during the heating operation, the supply speed of the air blown into the air-conditioned space from the air supply port becomes relatively fast, and the amount of air in the air-conditioned space attracted by the air blown into the air-conditioned space Will increase. Along with this, the supply speed of the air blown out from the air supply port is quickly reduced after being blown out from the air supply port, and the entire work area formed below in the air-conditioned space is heated and comfortable. It becomes possible to be an environment. Further, it is possible to attract the high-temperature air that has risen to the upper part in the air-conditioned space and return it to the lower work area in the air-conditioned space.

  According to the present invention, the heating efficiency of the replacement ventilation system can be improved. In addition, there is no fear that the human being in the work area formed in the lower part of the air-conditioned space will be uncomfortable due to the wind speed.

It is a schematic block diagram for demonstrating the replacement ventilation system concerning embodiment of this invention, and has shown the state at the time of air_conditionaing | cooling operation. It is a schematic block diagram for demonstrating the replacement ventilation system concerning embodiment of this invention, and has shown the state at the time of heating operation. It is a front view of one side of an air-conditioned space in which an air supply chamber is installed. It is a front view of the air supply port which attached the fin so that the turning component of a counterclockwise rotation direction seeing from the indoor side of an air-conditioned space might be given to low temperature air. It is a front view of the air supply opening | mouth which attached the fin so that the turning component of a clockwise rotation direction might be given to low temperature air seeing from the indoor side of an air conditioned space. It is explanatory drawing of the air supply port which made the swirl component of the low temperature air blown off from an adjacent air supply port alternately the reverse rotation direction. It is explanatory drawing of the air supply port which made the rotation component of the low temperature air blown out from an adjacent air supply port the same rotation direction. It is explanatory drawing of the replacement ventilation system of an Example. It is explanatory drawing of the analysis at the time of the cooling operation of an Example. It is a temperature distribution figure in the air-conditioning space at the time of the cooling operation of an Example. It is explanatory drawing of the analysis at the time of the heating operation of an Example. It is a temperature distribution figure in the air-conditioning space at the time of the heating operation of an Example.

  Hereinafter, a replacement ventilation system 1 according to an embodiment of the present invention will be described with reference to the drawings. In addition, in this specification and drawing, about the component which has the substantially same function structure, duplication description is abbreviate | omitted by attaching | subjecting the same code | symbol.

  The air-conditioned space 10 that is air-conditioned by the replacement ventilation system 1 is, for example, a factory, a warehouse, an office, a computer room, a guest room, a banquet hall, a game room, a printing room, a hospital room, a toilet, a kitchen, a machine room, a boiler room, etc. is there. The air-conditioned space 10 is a space defined by a ceiling, a floor, and side walls.

  As shown in FIGS. 1 and 2, a heating element 11 such as an OA device or a person exists on the floor of the air-conditioned space 10. An air supply chamber 15 for supplying temperature-controlled air (supply air SA) into the air-conditioned space 10 is installed in the lower part of the air-conditioned space 10. As shown in FIG. 3, two air supply chambers 15 are installed side by side on one side surface 20 of the air-conditioned space 1. On the front surface 16 of each air supply chamber 15, a plurality of air supply ports 17 are arranged side by side in the vertical and horizontal directions. Also, two upper exhaust ports 21 and two lower exhaust ports 22 are provided on one side surface 20 of the air-conditioned space 1 in which the air supply chamber 15 is installed.

  The exhaust port 21 provided in the upper part of the air-conditioned space 1 is at a position higher than the upper end of the air supply port 17. That is, the exhaust port 21 provided in the upper part of the air-conditioned space is positioned higher than the upper end of the highest air supply port 17 among the plurality of air supply ports 17 provided in the front surface 16 of the air supply chamber 15. It is in. On the other hand, the exhaust port 22 provided in the lower part of the air-conditioned space 1 has a height that does not exceed the upper end of the upper end of the air supply port 17. That is, the exhaust port 22 provided in the lower part of the air-conditioned space 1 is the same as the upper end of the highest air supply port 17 among the plurality of air supply ports 17 provided on the front surface 16 of the air supply chamber 15, or Is in a lower position.

  Further, the exhaust port 21 provided in the upper part of the air-conditioned space 1 is provided at a position higher than the upper end of the heating element 11 existing in the lower part of the air-conditioned space 1.

  The total area of the upper exhaust port 21 (the total area of the two upper exhaust ports 21) and the total area of the lower exhaust port 22 (the total area of the two lower exhaust ports 22) are both supplied. It is smaller than the total area of the mouth 17. For example, the total area of the upper exhaust port 21 is about 1/3 to 1/4 of the total area of the air supply port 17. Similarly, for example, the total area of the lower exhaust ports 22 is about 1/3 to 1/4 of the total area of the air supply ports 17.

  As shown in FIGS. 1 and 2, an air supply duct 26 is connected to the air supply chamber 15 from an air conditioner 25. As shown in FIG. 3, two air conditioners 25 are provided outside the air-conditioned space 10, and the two air supply chambers 15 are supplied from these two air conditioners 25 via the air supply duct 26. Air-conditioned supply air SA is supplied. An open / close damper 24 is provided between the air supply duct 26 and each air supply chamber 15. By operating the open / close damper 24, the supply of the supply air SA to the two supply chambers 15 can be controlled. For example, when both the two open / close dampers 24 are opened and the supply air SA is supplied to the two supply chambers 15, the number of the supply chambers 15 is two. On the other hand, when only one of the two open / close dampers 24 is opened and the other open / close damper 24 is closed, the supply air SA is supplied to only one supply chamber 15, and the supply number of the supply chambers 15 is one. It becomes. Thus, by operating the open / close damper 24, the number of air supply chambers 15 can be changed.

  In addition, by changing the number of air supply chambers 15 to be discharged in this way, it is possible to change the air supply SA blowing speed from each air supply port 17. That is, comparing the case where the number of blowouts is two and one, when both of the two open / close dampers 24 are opened and the number of blowouts of the air supply chamber 15 is two, two air conditioners 25 to two The supply air SA is supplied to the supply chamber 15. On the other hand, when only one of the two open / close dampers 24 is opened and the other open / close damper 24 is closed to reduce the number of air supply chambers 15 to one, the two air conditioners 25 can provide one unit. The supply air SA is supplied to the supply chamber 15. Therefore, when the number of air supply chambers 15 is set to one, the amount of air supplied to one air supply chamber 15 is substantially twice that of the case where the number of air supply chambers 15 is set to two. SA will be supplied. For this reason, when the number of the air supply chambers 15 is set to one, the supply speed of the supply air SA from each of the air supply ports 17 is substantially doubled as compared with the case where the number is set to two.

  Outside air OA is introduced into each air conditioner 25 through an outside air duct 27. Each air conditioner 25 includes a heat exchanger 28 and a filter (not shown) for cooling and heating the outside air OA, and the outside air OA taken into each air conditioner 25 is received by the heat exchanger 28 and the filter. The air supply SA is air-conditioned. In addition, each air conditioner 25 includes an air supply fan 29 that supplies air-conditioned air supply SA into the air-conditioned space 10 through the air supply duct 26 and the air supply chamber 15. With the operation of the air supply fan 29, the air supply SA is supplied from the plurality of air supply ports 17 formed in the front surface 16 of each air supply chamber 15 toward the inside of the air-conditioned space 10.

  As shown in FIGS. 4 and 5, a plurality of fins 30 are attached to each air supply port 17. A support member 31 is provided in the center of each air supply port 17, and the fins 30 are radially attached around the support member 31 at appropriate equal intervals. In addition, each fin 30 is arranged to be inclined with respect to the central axis 17 ′ of the air supply port 17 in order to give a swirling component to the air supply SA blown out from the air supply port 17 toward the inside of the air-conditioned space 10. 4 and 5, the inclination directions of the fins 30 are opposite to each other.

  As described above, the fins 30 inclined to the respective air supply ports 17 are attached in a radial manner, so that the air supply SA that has flowed from the inside of the air supply chamber 15 toward the air supply port 17 passes through the air supply ports 17. In doing so, it can be forced to flow along each fin 30. Thereby, the swirl component centering on the central axis 17 ′ is given to the air supply SA blown out from the air supply port 17 toward the air-conditioned space 10.

  Here, in FIGS. 4 and 5, the inclination directions of the fins 30 are opposite to each other with respect to the above-described blowing member, and depending on the fins 30 shown in FIG. When the front surface 16 of 15 is viewed from the indoor side of the air-conditioned space 10, a swirl component in the counterclockwise direction is given to the air supply SA. On the other hand, depending on the fin 30 shown in FIG. 5, when the front surface 16 of the air supply chamber 15 is viewed from the indoor side of the air-conditioned space 10 when passing through the air supply port 17, a swirling component in the clockwise direction is supplied. Given to Qi SA.

  As described above, the plurality of air supply ports 17 are arranged vertically and horizontally on the front surface 16 of the air supply chamber 15, but the swirl components of the air supply SA blown from the adjacent air supply ports 17 are opposite to each other. The rotation direction is related. That is, for example, as shown in FIG. 6, four air supply ports 17a, 17b, 17c, and 17d arranged in the vertical direction will be described as an example. The first air supply port 17a and the third air supply port from the top are described. In 17c, the inclination direction of the fin 30 is in the state described with reference to FIG. 4, and the supply air SA to which the swirl component in the counterclockwise rotation direction is blown out from the supply port 17a and the supply port 17c. On the other hand, in the second air supply port 17b and the fourth air supply port 17d from the top, the inclination direction of the fin 30 is the state described with reference to FIG. 5, and the air supply port 17b and the air supply port 17d The supply air SA given the swirl component in the rotation direction is blown out. In this way, the air supply swirling in the opposite rotation direction between the adjacent air supply port 17a and the air supply port 17b, the air supply port 17b and the air supply port 17c, and the air supply port 17c and the air supply port 17d, respectively. SA is blown out.

  Here, as shown in FIG. 7, the supply air SA that turns in the same rotational direction from the four supply ports 17a, 17b, 17c, and 17d arranged in the vertical direction (in the example shown in FIG. When the air supply SA that turns clockwise is blown, the air supply port 17a is connected to the air supply port 17b, the air supply port 17b is connected to the air supply port 17c, and the air supply port 17b is connected to the air supply port 17c. Then, the supply air SA is blown out in a direction that cancels each other. If it does so, the turning component of supply air SA which blows off from each supply port 17a, 17b, 17c, 17d will be canceled.

  On the other hand, as described with reference to FIG. 6, if the swirl components of the air supply SA blown out from the air supply ports 17a, 17b, 17c, and 17d are alternately reversed, the air supply ports 17a and 17b Since the air supply SA is blown out in the same direction between the air supply port 17b and the air supply port 17c and between the air supply port 17b and the air supply port 17c, each air supply port The swirl components of the supply air SA blown out from 17a, 17b, 17c, and 17d are not canceled out, and the swirl motions are promoted to each other.

  In FIG. 6, the relationship between the upper and lower air supply ports 17 has been described. However, as described above with reference to FIG. 3, a plurality of air supply ports 17 are vertically and horizontally arranged on the front surface 16 of the air supply chamber 15. They are arranged side by side. Therefore, not only the relationship between the upper and lower air supply ports 17 but also between the air supply ports 17 arranged horizontally, the swirl components of the air supply SA blown from the adjacent air supply ports 17 are mutually different. The inclination direction of the fin 30 provided in each air supply port 17 is set so that it may become the relationship of a reverse rotation direction.

  As shown in FIGS. 1 and 2, an exhaust duct 41 for cooling operation provided with an exhaust fan 40 is connected to each exhaust port 21 provided at an upper portion of one side surface 20 of the air-conditioned space 1. As will be described later, during the cooling operation, the air accumulated in the upper part of the air-conditioned space 10 due to the operation of the exhaust fan 40 (air heated by the heating element 11 such as a person or a device existing in the air-conditioned space 10) The air is exhausted EA through the cooling operation exhaust duct 41. Further, a part of the exhaust gas EA passing through the cooling operation exhaust duct 41 is returned as return air to the air-mixing portion 43 of each air conditioner 25 through the rising return duct 42 and mixed with the outside air OA. Note that the air volume ratio between the exhaust air EA exhausted to the outside through the cooling operation exhaust duct 41 and the return air returned to each air conditioner 25 is adjusted by a damper (not shown).

  Further, an exhaust duct 46 for heating operation provided with an exhaust fan 45 is connected to each exhaust port 22 provided in the lower part of one side surface 20 of the air-conditioned space 1. As will be described later, during the heating operation, the high-temperature air that has risen above the air-conditioned space 10 is returned to the work area formed in the lower portion of the air-conditioned space 1 by the operation of the exhaust fan 45, and the exhaust for heating operation is performed. It is discharged to the outside through the duct 46 as exhaust EA. Further, a part of the exhaust EA passing through the heating operation exhaust duct 46 is returned as return air to the air-mixing portion 43 of each air conditioner 25 through the return duct 47 and mixed with the outside air OA. Note that the air volume ratio between the exhaust EA exhausted to the outside through the heating operation exhaust duct 46 and the return air returned to each air conditioner 25 is adjusted by a damper (not shown).

  In the replacement ventilation system 1 configured as described above, at the time of cooling operation, low-temperature air is blown out from the air supply port 17 on the front surface of the air supply chamber 15 toward the air-conditioned space 10, and the exhaust duct 41 for cooling operation. The exhaust fan 40 provided in the above is operated to exhaust air from the exhaust port 21 provided in the upper part of the air-conditioned space 10. In this case, the total area of the upper exhaust ports 21 (the total area of the two upper exhaust ports 21) is smaller than the total area of the air supply ports 17. For example, the total area of the upper exhaust ports 21 is The total area of the air supply port 17 is about 1/3 to 1/4. For this reason, the supply air SA blown out from the air supply port 17 toward the air-conditioned space 10 is supplied into the air-conditioned space 10 at a speed suitable for replacement ventilation that does not feel a draft at a relatively low speed. On the other hand, the air exhausted from the exhaust port 21 in the upper part of the air-conditioned space 10 has a relatively high speed. During the cooling operation, the exhaust fan 45 provided in the heating operation exhaust duct 46 is not operated, and the exhaust from the exhaust port 22 provided in the lower part of the air-conditioned space 10 is not performed.

  That is, during the cooling operation, the outside air OA taken into the air conditioner 25 is mixed with the return air, cooled by the heat exchanger 28, and converted into low-temperature air (supply air SA). Then, the supply air SA produced by the air conditioner 25 is supplied at a relatively slow wind speed into the air-conditioned space 10 through the supply air duct 26 and the supply air chamber 15 by the operation of the supply air fan 29. When passing through the air supply port 17, a swirl component is given to the air supply SA by the fins 30 attached to the air supply port 17, and thus, from each air supply port 17 toward the air-conditioned space 10. The air supply SA is supplied while turning.

  Then, the attraction | suction effect | action which the air in the air-conditioning space 10 is attracted to the supply air SA which blown out from each air supply port 17 moves together works. In this case, in the illustrated replacement ventilation system 1, since the swirl component is given to the supply air SA blown out from the supply port 17, the amount of air that is attracted by the supply air SA (attraction ratio). ) Will increase. Along with this, the speed of the supply air SA is quickly reduced after it is blown out from each supply port 17 according to the law of conservation of momentum.

  The supply air SA thus supplied into the air-conditioned space 10 flows so as to descend downward in the air-conditioned space 10 due to a temperature difference, and fills the work area formed below in the air-conditioned space 10 at a low speed. The work area can be maintained in a comfortable environment.

  On the other hand, since a heating element 11 such as a person or a device as a heating element exists in, for example, a work area in the conditioned space 10, the supply that is supplied into the conditioned space 10 and is in thermal contact with the heating element 11. The air SA is eventually heated and gradually rises. Due to the upward flow, contaminants such as dust and gas generated in the air-conditioned space 10 can be conveyed upward in the air-conditioned space 10.

  Further, when the supply air SA is in thermal contact with the heating element 11 and heated, there is a temperature gradient in the air-conditioned space 10 in which the temperature gradually decreases from the upper end of the heating element 11 to the upper exhaust port 21. It is formed. In this case, for example, the position of the upper exhaust port 21 is set to be higher than the intermediate height between the upper end of the heating element 11 and the ceiling of the air-conditioned space 10, so that it is formed from the upper end of the heating element 11 to the exhaust port 21. The temperature gradient in the vertical direction in the air-conditioned space 10 can be reduced. Moreover, by making the position of the exhaust port 21 provided in the upper part of the air-conditioned space 10 as high as possible, it is possible to avoid that hot air existing near the ceiling of the air-conditioned space 10 falls to the work area. This makes it possible to keep the work area in a comfortable cooling environment.

  The air accumulated in the upper part of the air-conditioned space 10 (heated air) is not agitated, that is, without disturbing the temperature stratification such as the work area formed in the air-conditioned space 10. By operation, the exhaust gas is discharged to the outside as an exhaust air EA at a wind speed of, for example, 2 to 3 m / sec through the exhaust port 21 and the cooling operation exhaust duct 41. In this way, the air-conditioning space 10 is ventilated by exhausting the contaminants such as dust and gas together with the heated air from the upper part of the air-conditioning space 10 while supplying the supply air SA downward in the air-conditioning space 10. The lower part in the air-conditioned space 10 is maintained in a clean air supply SA environment.

  On the other hand, in this replacement ventilation system 1, during heating operation, high-temperature air is blown out from the air supply port 17 on the front surface of the air supply chamber 15 toward the air-conditioned space 10, and an exhaust fan provided in the exhaust duct 46 for heating operation 45 is operated to exhaust air from the exhaust port 22 provided in the lower part of the air-conditioned space 10. During the heating operation, the exhaust fan 40 provided in the cooling operation exhaust duct 41 is not operated, and the exhaust from the exhaust port 21 provided in the upper part of the air-conditioned space 10 is not performed.

  That is, during the heating operation, the outside air OA taken into the air conditioner 25 is mixed with the return air and heated by the heat exchanger 28 to be converted into high-temperature air (supply air SA). Then, the supply air SA produced by the air conditioner 25 is supplied at a relatively slow wind speed into the air-conditioned space 10 through the supply air duct 26 and the supply air chamber 15 by the operation of the supply air fan 29. When passing through the air supply port 17, similarly, a swirl component is given to the air supply SA by the fins 30 attached to the air supply port 17, and each air supply port 17 is directed toward the air-conditioned space 10. The air supply SA is supplied while turning. Thus, the speed of the supply air SA blown out from the air supply port 17 is quickly reduced after being blown out from each air supply port 17, and the entire work area formed below in the air-conditioned space 10 is heated. It is possible to create a comfortable environment.

  On the other hand, since the supply air SA supplied to the work area in this way is high temperature, it tends to rise with buoyancy with the passage of time and flow upward from the work area. However, in this replacement ventilation system 1, during the heating operation, exhaust is performed from the exhaust port 22 provided in the lower part of the air-conditioned space 10 by the operation of the exhaust fan 40. As a result, the supply air SA once raised above the air-conditioned space 10 flows toward the exhaust port 22 provided in the lower part of the air-conditioned space 10, thereby returning the air supply SA to the work area again. Thus, the heating efficiency for the work area is improved.

  In addition, the total area of the lower exhaust ports 22 (the total area of the two lower exhaust ports 22) is smaller than the total area of the air supply ports 17, for example, the total area of the lower exhaust ports 22 is The total area of the air supply port 17 is about 1/3 to 1/4. For this reason, the air exhausted from the exhaust port 22 below the air-conditioned space 10 becomes relatively high speed (for example, 2 to 3 m / sec), and the air supply SA that has risen above the air-conditioned space 10 due to the attraction effect is used as a work area. It can be pulled back effectively.

  Therefore, according to this replacement ventilation system 1, during cooling operation, low-temperature air (supply air SA) is blown out from the air supply port 17 to the lower part of the air-conditioned space 10, and the exhaust port 21 provided at the upper part of the air-conditioned space 10. By exhausting from the air-conditioned space 10, while cooling the work area formed in the lower part of the air-conditioned space 10, the air-conditioned space 10 is exhausted from the upper part of the air-conditioned space 10 together with heated air and contaminants such as dust and gas. The inside of the air-conditioned space 10 is kept in a clean air supply SA environment. During heating operation, high-temperature air (supply air SA) is blown out from the air supply port 17 on the front surface of the air supply chamber 15 toward the air-conditioned space 10 and exhausted from an exhaust port 22 provided in the lower part of the air-conditioned space 10. By performing the above, the air supply SA once raised above the air-conditioned space 10 can be returned to the work area again. As a result, the heating efficiency for the work area is improved during the heating operation.

  Further, in this replacement ventilation system 1, the supply speed of the supply air SA into the air-conditioned space 10 can be changed by changing the number of supply air chambers 15. For example, at the time of cooling operation, both the two open / close dampers 24 are opened to supply the supply air SA to the two supply chambers 15 and the number of the supply chambers 15 to be blown out is two. Thus, during the cooling operation, the number of air supply chambers 15 is increased, and the supply speed of the air supply SA that is blown out from the air supply port 17 into the air-conditioned space 10 is reduced. As a result, the air supply SA that does not feel a relatively low-speed draft from the air supply port 17 toward the air-conditioned space 10 is supplied.

  On the other hand, during the heating operation, only one of the two open / close dampers 24 is opened and the other open / close damper 24 is closed so that the number of air supply chambers 15 blown out is one. Thus, during the heating operation, the number of air supply chambers 15 is reduced, and the supply speed of the supply air SA that is blown out from the air supply port 17 into the air-conditioned space 10 is increased. Thus, the air supply SA (warm air) that has risen above the air-conditioned space 10 can be pulled back to the work area by the effect of attracting the air-supply SA supplied from the air supply port 17 toward the air-conditioned space 10.

  In addition, as shown in FIG. 1, during the cooling operation, a part of the exhaust EA is returned to the air conditioner 25 through the return duct 42 so that the cold energy can be reused. Similarly, as shown in FIG. 2, during heating operation, part of the exhaust EA is returned to the air conditioner 25 through the return duct 47, so that the heat can be reused. As a result, energy saving can be achieved.

  As mentioned above, although an example of preferable embodiment of this invention was demonstrated, this invention is not limited to the form of illustration. Although the example in which two air supply chambers 15 are installed in the air-conditioned space 10 has been described above, there may be three or more air supply chambers 15. For example, during cooling operation, the number of air supply chambers 15 is increased by increasing or decreasing the supply speed of the air supply SA 10 by changing the number of air supply chambers 15 that are blown out. The supply speed of the supply air SA that is blown out from the opening 17 into the air-conditioned space 10 is slowed down. On the other hand, during the heating operation, the supply air SA that is blown out from the supply opening 17 into the air-conditioned space 10 is reduced. The feeding speed can be increased.

  For example, the lower end of the exhaust port 22 provided in the lower part of the air-conditioned space 1 may be in contact with the floor surface of the air-conditioned space 1. Moreover, the exhaust port 22 provided in the lower part of the air-conditioned space 1 may be arranged on the floor surface of the air-conditioned space 1. For example, in a system that performs replacement ventilation by floor blowing, the exhaust port 22 provided in the lower part of the air-conditioned space 1 may be arranged on the floor surface of the air-conditioned space 1.

  Further, in the cooling operation, the example in which the air accumulated in the upper portion of the air-conditioned space 10 is exhausted from the exhaust port 21 provided in the upper portion of the air-conditioned space 1 has been described. Exhaust may be performed with a pressure fan or the like.

  Further, in the cooling operation, the example in which the operation of the exhaust fan 45 provided in the heating operation exhaust duct 46 is stopped has been described. However, by installing an open / close damper in the heating operation exhaust duct 46 and closing the open / close damper. The exhaust of the exhaust port 22 provided in the lower part of the air-conditioned space 10 may be stopped. Similarly, in the heating operation, the example in which the exhaust fan 40 provided in the cooling operation exhaust duct 41 stops operating has been described. However, an opening / closing damper is installed in the cooling operation exhaust duct 41, and this opening / closing damper is installed. By closing, exhaust of the exhaust port 21 provided in the upper part of the air-conditioned space 10 may be stopped.

  Further, in the above-described embodiment, the example in which the fins 30 are radially attached to the air supply ports 17 and the swirl component is given to the air supply SA has been described. However, it is not always necessary to give the swirl component to the air supply SA. For example, the air supply SA may be diffused in a work area formed below the air-conditioned space 10 using a diffuser or the like. Further, the exhaust port 21 installed in the upper part of the air-conditioned space 10 may be formed in the ceiling of the air-conditioned space 10. Similarly, you may form the exhaust port 22 installed in the lower part of the air-conditioned space 10 in the floor of the air-conditioned space 10. Furthermore, the replacement ventilation system of the present invention can be applied to various conditioned spaces.

  As an example of the replacement ventilation system 1 of the present invention, an analysis was performed by a simulation program “TRANSYS”. As shown in FIG. 8, in the replacement ventilation system 1 of the embodiment, it is assumed that 20 devices 11 that generate heat are placed inside the air-conditioned space 10. The size (analysis region) of the air-conditioned space 10 is 35 m (width) × 18.6 m (width) × 8.8 m (height).

(During cooling operation)
As analysis conditions in summer, the roof surface is 55 ° C., 0.85 W / m ² ° C., illumination is 15 W / m ² , the outer wall is 40 ° C., 1.4 W / m ² ° C., and the heating value of the heating element 11 (equipment) is 2.4 kW / It was set to 20 units. As shown in FIG. 9, 9600 m ³ / h, 18 ° C. supply air SA is supplied from the two supply chambers 15 to the inside of the air-conditioned space 10, and an exhaust port provided in the upper part of the air-conditioned space 10. Exhaust EA was discharged from 21.

  As a result of the analysis, the behavior of the air flow of the supply air SA is as shown in FIG. The supply air SA blown out from the supply chamber 15 flows so as to sew the gaps between the heating elements 11, and the supply air SA is effectively distributed in the work area formed in the lower part of the air-conditioned space 10. In the working area, the temperature on the same height plane was almost uniform. On the other hand, the temperature inside the air-conditioned space 10 is high, and effective air conditioning is realized only in the work area.

  FIG. 10 shows the temperature distribution in the air-conditioned space 10 during the cooling operation. When the vertical section A in the air-conditioned space 10 was viewed, a high temperature region A1 was formed so as to rise upward from each heating element 11. However, around each heating element 11, the work area became the low temperature area A2, and the work area was effectively cooled.

(During heating operation)
As analysis conditions in winter, roof surface 0 ° C., 0.85 W / m ² ° C., illumination 0 W / m ² , outer wall 0 ° C., 1.4 W / m ² ° C., floor surface 15 ° C., no heat generation of heating element 11 . As shown in FIG. 11, supply air SA of 9600 m ³ / h and 30 ° C. is supplied from the two air supply chambers 15 to the inside of the air-conditioned space 10. Exhaust EA was discharged from No.22.

  As a result of the analysis, the behavior of the air flow of the supply air SA is as shown in FIG. The supply air SA blown out from the supply chamber 15 rises quickly and does not flow directly to the work area formed in the lower part of the air-conditioned space 10, but the exhaust port 22 is located in the lower part of the air-conditioned space 10. The upper warm air (supply air SA) gradually decreased, and warm air was distributed to the work area. In order to supply warm air directly to the work area, an air velocity that overcomes buoyancy is required, and the wind speed in the work area increases. ADVANTAGE OF THE INVENTION According to this invention, appropriate heating is implement | achieved, without producing the excessive wind speed in a working area.

  FIG. 12 shows the temperature distribution in the air-conditioned space 10 during the heating operation. Looking at the horizontal cross section B in the air-conditioned space 10, a substantially uniform temperature region B1 was formed in a portion other than just before the air supply chamber 15, and the entire work region could be effectively heated.

  The present invention is useful for air conditioning in factories, warehouses, offices, computer rooms, guest rooms, banquet halls, game halls, printing rooms, hospital rooms, toilets, kitchens, machine rooms, boiler rooms, and the like.

SA Air supply OA Outside air 1 Replacement ventilation system 10 Air-conditioned space 11 Heating element 15 Air supply chamber 16 Front surface 17 Air supply port 20 One side surface 21 Upper exhaust port 22 Lower exhaust port 25 Air conditioner 26 Air supply duct 27 Outside air duct 28 Heat Exchanger 29 Air supply fan 30 Fin 31 Support member 40 Exhaust fan 41 Exhaust duct 42 for cooling operation Return duct 45 Exhaust fan 46 Exhaust duct 47 for heating operation Return duct

Claims (6)

A replacement ventilation system that ventilates an air-conditioned space by supplying air into the air-conditioned space and exhausting the air-conditioned space,
An air supply port is provided in the lower part of the air-conditioned space, an exhaust port is provided in the upper part and the lower part of the air-conditioned space, and the exhaust port provided in the upper part of the air-conditioned space is made higher than the upper end of the air supply port, The exhaust port provided in the lower part of the air-conditioned space has a height not exceeding the upper end of the air supply port,
During cooling operation, low temperature air is blown out from the air supply port, and exhausted from an exhaust port provided in the upper part of the air-conditioned space.
A replacement ventilation system that blows out high-temperature air from the air supply port and exhausts air from an exhaust port provided in a lower portion of the air-conditioned space during heating operation.   The replacement ventilation system according to claim 1, wherein a heating element is present in a lower part of the conditioned space, and an exhaust port provided in an upper part of the conditioned space is provided at a position higher than an upper end of the heating element.   The replacement ventilation system according to claim 1 or 2, wherein a plurality of air supply chambers provided with the air supply ports are provided, and the number of the air supply chambers is variably configured. A replacement ventilation method that ventilates the air-conditioned space by supplying air into the air-conditioned space and exhausting the air-conditioned space,
An air supply port is provided in the lower portion of the air-conditioned space, an exhaust port is provided in the upper and lower portions of the air-conditioned space, and the exhaust port provided in the upper portion of the air-conditioned space is higher than the upper end of the air supply port. The height of the exhaust port provided at the lower part of the air-conditioned space does not exceed the upper end of the air supply port,
During cooling operation, low temperature air is blown out from the air supply port, and exhausted from an exhaust port provided in the upper part of the air-conditioned space.
A replacement ventilation method in which high-temperature air is blown out from the air supply port and air is exhausted from an exhaust port provided in a lower portion of the air-conditioned space during heating operation.   The replacement ventilation method according to claim 4, wherein a heating element is present in a lower portion of the conditioned space, and an exhaust port provided in an upper portion of the conditioned space is provided at a position higher than an upper end of the heating element. A plurality of air supply chambers provided with the air supply ports;
The replacement ventilation method according to claim 4 or 5, wherein the air is blown out from a smaller number of air supply chambers during heating operation than during cooling operation.

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